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By iddy
The same method can be used to make things invisible, the light waves just have to be perfectly in phase (which is fairly difficult to do if its not from the same source.)

If noisy appliances let out 2 frequencies, 180 degrees difference between them, then the appliance (being in phase, due to the noise coming from the same source) should be silence.
There wouldn't be any damage to ears either, as (if the waves are in phase + from the same source) the net movement in the air particles would be zero, so ((+1) + (-1) = 0).

Just thought it would be worth sharing this..

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